Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e286201c1540928…

MALICIOUS

PDF

90.6 KB Created: 2021-07-23 12:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 41701a514d63970a3dd643786d2dd3aa SHA-1: 72537bfc19a3f0f6074341772fc4d51f2c713bc3 SHA-256: 3e286201c1540928980b86fee66a42156d2a05d510f2ab9c3b89a33fe2e47583
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload storage locations and disposable hosting sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://teplospectr.ru/images/files/gilefewuwelusib.pdf In PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/36496913462.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d66d5a28ab---47857018952.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/3394737326.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b741e21ec9---seledodunofizusoz.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/dozilumezutitojidek.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/sotudijegusafidagatinu.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/fozujatefinolekoseliguw.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/kopika.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/ca15378e5fe493ed6698eeabd70015d1/lirugugazebizuxaxup.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/jidaro.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9d74da7fb---wovokuxofaloronoruwazalik.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ba58cfefa42b2f84349653a7c4c22de3/gubujuvawaxewilusinure.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/pqbi0o8svjrgqqv6vdm4a8lta3/42390227600.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/e87cj1gkckv93h5tuj51q5dv6i/vajupiw.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160810ecd38542---32824872489.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/4512884113.pdfIn PDF document text
    • http://mousike.it/img_ins/files/nuvakejevulijerik.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/d7bc95b36a5b4822d6cef045cf0b89e8/wobitafurimasifelulura.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/7d5484f4a0f6af26fd05874f6d0c5ebc/vomexidax.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/kazapawa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6b779f3c4---51716216303.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/88619811487.pdfIn PDF document text
    • https://aodaixuan.vn/app/webroot/upload/image/files/mipox.pdfIn PDF document text
    • http://technocom.pl/editor/file/jejazux.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a3200cbb71b---lifididigus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=genetic+engineering+recombinant+dna+technologyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD92 17244 bytes
SHA-256: 38205b2bcb57021a6ded7c7876abe86e1da0f6f10b17d0dbeedb9147043c1a7d
font_01_sfnt_off00012a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001429e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1429E 10944 bytes
SHA-256: 655ca49b6e6137728ce032e04b2aa9325826fbaa94864812a05ae3337b070e7a

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